Combination microwave passive infrared motion detector with anti-masking evaluation
US6351234B1 · kind B1 · utility
17Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 2000 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | May 15, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/046
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A motion detector of an alarm system has a microwave sensor and a passive infrared sensor, and includes signal processing logic for initiating an anti-masking evaluation upon detection of certain conditions. The detector then samples the sensor signals and compares the signals to a series of possible outcomes. Some of the possible outcomes represent masking conditions, while others represent normal conditions. A match with masking conditions results in an alarm signal being generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.